diff --git a/src/openforms/formio/components/np_family_members/stuf_bg.py b/src/openforms/formio/components/np_family_members/stuf_bg.py
index 3117352cc2..51ba4fa708 100644
--- a/src/openforms/formio/components/np_family_members/stuf_bg.py
+++ b/src/openforms/formio/components/np_family_members/stuf_bg.py
@@ -8,15 +8,15 @@ def get_np_family_members_stuf_bg(
     include_partners: bool,
     submission: Submission | None = None,
 ) -> list[tuple[str, str]]:
-    values = []
+    attributes: list[str] = []
     if include_children:
-        values.append("inp.heeftAlsKinderen")
+        attributes.append("inp.heeftAlsKinderen")
 
     if include_partners:
-        values.append("inp.heeftAlsEchtgenootPartner")
+        attributes.append("inp.heeftAlsEchtgenootPartner")
 
     with get_client() as client:
-        data = client.get_values(bsn, values)
+        data = client.get_values(bsn, attributes)
 
     # Kids
     family_members = []
diff --git a/src/openforms/formio/components/np_family_members/tests/test_family_members.py b/src/openforms/formio/components/np_family_members/tests/test_family_members.py
index 3c35da6da2..3c8a81da95 100644
--- a/src/openforms/formio/components/np_family_members/tests/test_family_members.py
+++ b/src/openforms/formio/components/np_family_members/tests/test_family_members.py
@@ -2,7 +2,7 @@
 from pathlib import Path
 from unittest.mock import patch
 
-from django.test import TestCase
+from django.test import TestCase, tag
 from django.utils.html import format_html
 from django.utils.translation import gettext as _
 
@@ -150,6 +150,31 @@ def test_get_partners_stuf_bg(self, mock_stufbg_config_get_solo):
             self.assertEqual(("123123123", "Belly van Doe"), partners_choices[0])
             self.assertEqual(("456456456", "Bully van Doe"), partners_choices[1])
 
+    @tag("gh-3864")
+    @patch("stuf.stuf_bg.client.StufBGConfig.get_solo")
+    def test_get_single_partner_stuf_bg(self, mock_stufbg_config_get_solo):
+        stuf_bg_service = StufServiceFactory.build()
+        mock_stufbg_config_get_solo.return_value = StufBGConfig(service=stuf_bg_service)
+        soap_response_template = (
+            TEST_FILES / "stuf_bg_one_family_member.xml"
+        ).read_text()
+        response_content = render_from_string(soap_response_template, {}).encode(
+            "utf-8"
+        )
+
+        with requests_mock.Mocker() as m:
+            m.post(
+                stuf_bg_service.get_endpoint(type=EndpointType.vrije_berichten),
+                content=response_content,
+            )
+
+            partners_choices = get_np_family_members_stuf_bg(
+                bsn="111222333", include_children=False, include_partners=True
+            )
+
+            self.assertEqual(1, len(partners_choices))
+            self.assertEqual(("123123123", "Belly van Doe"), partners_choices[0])
+
     @patch("stuf.stuf_bg.client.StufBGConfig.get_solo")
     def test_get_family_memebers_stuf_bg(self, mock_stufbg_config_get_solo):
         stuf_bg_service = StufServiceFactory.build()
diff --git a/src/stuf/stuf_bg/client.py b/src/stuf/stuf_bg/client.py
index 0adb755161..0ac569cad1 100644
--- a/src/stuf/stuf_bg/client.py
+++ b/src/stuf/stuf_bg/client.py
@@ -69,6 +69,7 @@ def get_values(self, bsn: str, attributes: list[str]) -> dict:
                 response_data,
                 process_namespaces=True,
                 namespaces=NAMESPACE_REPLACEMENTS,
+                force_list=["inp.heeftAlsEchtgenootPartner", "inp.heeftAlsKinderen"],
             )
         )